[Intel-gfx] [PATCH] drm/i915: Fix rps irq warning

[Ben Widawsky]

On Sun, 04 Sep 2011 10:03:21 +0100
Chris Wilson <chris at chris-wilson.co.uk> wrote:

> On Sat,  3 Sep 2011 20:24:15 -0700, Ben Widawsky <ben at bwidawsk.net>
> wrote:
> > I couldn't reproduce this one, but...  Interrupt mask state is lost
> > if three interrupts occur before the workqueue has run.
> > 
> > Should be straight forward to reproduce even without SMP. I'm pretty
> > sure Dan Vetter was trying to explain this to me, and I couldn't
> > get it. My solution I think is different than his though.
> 
> This logic is now duplicated in ivybridge_irq_handler(). This simply
> fits the scenario Daniel described, whilst also fitting in with our
> understanding of IMR, IER and IIR. (A big assumption ;-)
> 
> Reported-by: Soeren Sonnenburg <sonne at debian.org>
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
> -Chris
> 

I completely screwed this one up because I was tired. Chris sent me this
exact patch, which I told him was wrong, and then proceeded  to rewrite
the same thing on my own. Chris, I suggest you resubmit what you sent me
privately with my reviewed by, and please accept my apology.

I am nak'ing my patch.

Ben